Ribbed eraser



FIG. 1 is a perspective view of the ribbed eraser showing our newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front view thereof, the rear view being identical; and,

FIG. 5 is a left side view, the right side view being identical.

The ornamental design for a ribbed eraser, as shown and described.